Mysterious Knocking Sound from inside my house last night
Posted 22 April 2013 - 09:06 PM
Heads up, you might want to change the sheets before you have company spend the night.
Posted 22 April 2013 - 09:08 PM
Posted 22 April 2013 - 10:30 PM
Had this happen to me recently, except mine was due to me having too many vents closed (the heat is unbearable on the third floor). With most of the vents upstairs closed, too much air was backing up in the duct work making it bow outward. When the heat shut off, they went back to their normal size making a loud banging noise.
2. If the HVAC returns are blocked, the dampers will flutter and echo through the duct work, but this occurs when the AC shuts off.
Took me a while to figure out what it was. Was afraid my HVAC unit was about to break and I was pissed because I've only lived in the house for a year.
Posted 23 April 2013 - 01:26 PM
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